Means for severing of weft yarn during weaving

ABSTRACT

An improved method and apparatus for severing weft yarns in a fabric woven from glass or carbon yarns on a loom in which the weft is inserted by a water jet an airjet or other shuttleless device in which the weft yarn is presented to a continuously rotating abrasive disc during beat up to sever the yarn.

United States Patent Yates June 5, 1973 [54] MEANS FOR SEVERING OF WEFTReferences Cited YARN DURING WEAVING UNITED STATES PATENTS [75]Inventor: Sidney Yates, Todmorden, England 3,455,342 7/1969 Golobart..139/302 1 Assigneei Fqtheljgill & Harvey Limited, 3,461,920 8/1969Sakamoto ..l39/302 Klttleboroughi England 2,673,577 3 1954 Mills a l..28/1 cs [22] Filed: May 19, 1971 2,271,600 2/1942 McRae et al...l39/303 [211 144837 Primary Examiner-l-lenry S. Jaudon Attorney-Norris& Bateman [30] Foreign Application Priority Data May 26, 1970 GreatBritain ..25,14o 7o [57] ABSTRACT An improved method and apparatus forsevering weft (gl 3693/93/23 yams in a fabric woven from glass or carbonyams on [58 Field of Search ..139/263, 264, 291 c, a the mated by awater Jet 139/302, 303; 66/145 B; 28/1 CS airjet or other shuttlelessdevice in which the weft yarn is presented to a continuously rotatingabrasive disc during beat up to sever the yarn.

3 Claims, 4 Drawing Figures Patented June 5, 1973 3,736,965

2 Sheets-Sheet 1 SIDNEY YATES NORRIS & BATEMAN Patented June 5, 19733,736,95

2 Shuts-Sheet 2 INVEA/TC) Q SIDNEY YATES BY 27ml. v @ZW NORRIS & BATEMANMEANS FOR SEVERING OF WEFT YARN DURING WEAVING This invention relates toan improved method for the severing of weft yarns in a fabric woven fromglass or carbon yarns.

The object of the invention is an improved method for the severing ofthe weft threads of woven fabric during the weaving operation, and moreparticularly to fabrics constructed from easily abraded fibers such asglass or carbon, and further with particular reference to fabrics wovenon a water-jet or similar high speed loom.

The method according to the invention comprises mounting a continuouslyrotating abrasive disc adjacent to the selvedge of a fabric being wovento abrade the weft yarn during beat up and means for controlling theyarn relatively to the disc.

The invention will be described with reference to the accompanyingdrawings:

FIG. 1 is a plan view of part of one side of a loom reed and sley withthe severing disc for the weft in position;

FIG. 2 is a similar plan view of the opposite side of the loom.

FIG. 3 is a side elevation of the severing disc shown in FIG. 1 lookingin the direction of the arrow A in FIG.

FIG. 4 is a side elevation of the severing disc shown in FIG. 2 lookingin the direction of the arrow B in FIG. 2.

The method is carried out on a loom of normal construction with a slaycarrying a reed and healds through which warp yarns 11 pass and whichform the shed.

An abrasive disc 1 driven by an electric motor 2 is mounted on the loomframe in close proximity to the selvedge of the fabric 3 being woven,with the axis of the disc parallel to that of the weft 4.

The weft 4 may be propelled through the shed of a water-jet loom by awater jet 5 in which discrete quanta of water are used to propel theweft yarn; or the weft may be inserted by air jets or by othershuttle-less devices.

A pair of serrated weft guide plates 6 are mounted in the end of a reed7. In operation the weft is inserted through the shed and clamped by aclamp 7 behind the jet orifice. As the reed begins to beat up, the weft4 located in serrations 6 of the plates 6 passes over and is tensionedbetween the plates 6 and as the reed advances the weft between theplates is presented to the disc 1 and is severed.

A second abrasive disc 8 driven by a motor 9 is mounted on the oppositeside of the loom frame in close proximity to the opposite side of theloom frame in close proximity to the opposite selvedge again with theaxis of the disc parallel to that of the weft.

As the weft yarn 4 completes its traverse through the shed of the warpyarns l1 and reaches this side of the loom, it is caught between threethreads warp yarns 12 which are continuously twisted together by aseparate mechanism of known construction. The weft before being twistedup with the warp yarns 12 passes over two fixed weft guide plates 13 onthe loom frame between which the disc 8 rotates.

The warp yarns 12 retain the tension on the weft yarns 4 which afterbeing caught up with the warp yarns are severed by the disc 8 and thesevered ends are taken away with the warp yarns 12.

As the position of the healds changes at the end of the sequence ofoperations in which the weft yarn 4 is inserted, the weft yarn is heldbetween the warp threads 1 1 and the selvedge is tensioned by thecontinued twisting of the aforementioned three catching warp yarns 12.

By this means, the weft yarn 4 is pulled firmly against the abrasivecutting disc 8 on the right hand side of the loom. The two guide plates13 prevent the weft yarn from moving tangentially with respect to thedisc 8.

The abrasive wheels 1, 8 are required to run continuously during weavingoperation at a high surface speed.

The foregoing parts are mounted as a standard loom frame (not shown).

What I claim is:

1. Apparatus for severing weft yarn in a loom having a sley and a reedcomprising a continuously rotating disc mounted at one side of the loomadjacent the fabric being woven, a pair of plates mounted on one end ofthe reed and over which the weft is adapted to extend, said disc beingdisposed to rotate between said plates and said plates having serrationsto locate the yarn thereon, means for applying tension to the weftextending over the plates and means for bringing the weft after eachpick into contact with the disc to sever the web.

2. Apparatus for severing weft yarn as in claim 1 comprising a secondcontinuously rotating disc similarly mounted at the opposite side of theloom, a second pair of serrated plates mounted on the loom between whichthe second disc rotates, means for applying tension to the weft yarnextending over said plates and means for bringing a weft yarn at beat upinto contact with the second disc to sever the yarn.

3. Apparatus as in claim 1 and an electric motor for continuouslydriving the rotating disc.

1. Apparatus for severing weft yarn in a loom having a sley and a reedcomprising a continuously rotating disc mounted at one side of the loomadjacent the fabric being woven, a pair of plates mounted on one end ofthe reed and over which the weft is adapted to extend, said disc beingdisposed to rotate between said plates and said plates having serrationsto locate the yarn thereon, means for applying tension to the weftextending over the plates and means for bringing the weft after eachpick into contact with the disc to sever the web.
 2. Apparatus forsevering weft yarn as in claim 1 comprising a second continuouslyrotating disc similarly mounted at the opposite side of the loom, asecond pair of serrated plates mounted on the loom between which thesecond disc rotates, means for applying tension to the weft yarnextending over said plates and means for bringing a weft yarn at beat upinto contact with the second disc to sever the yarn.
 3. Apparatus as inclaim 1 and an electric motor for continuously driving the rotatingdisc.